/Engine/Plugins/Experimental/PCG/Source/PCG/Public/Metadata/PCGMetadata.h
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="PCG|Metadata") void AccumulateWeightedAttributesByKey ( int64 Key, const [UPCGMetadata](API\Plugins\PCG\Metadata\UPCGMetadata) * Metadata, float Weight, bool bSetNonInterpolableAttributes, int64 TargetKey, int64 & OutKey )